These are quite cute, though I don't quite get them. That's probably just because I don't follow the fandom, and I'm a bit behind on both DW and SPN.

This is the right place to post these, so don't worry about that! If this is going to be a long-term thing, I recommend putting them on a site like Smackjeeves instead of here, or making a Tumblr for them. That way, people don't have to load a gazillion images at once, and they'd be notified when you update.

Since the style is so simple-looking, the copy+pasted parts really stand out as lazy. I think you should take the time to redraw similar panels, it shouldn't take a lot of time and it'll look better. It'd be better practice for you, too.

DW: Thanks, but this is just a silly comic thing I'm making.
DW: It's supposed to look really dumb and it shouldn't make sense!
DW: The only person who actually know's where all this shiz came fro is Angelic Headtilts and Drunkard Roxy Lalonde, so even though you're even caught up with SPN and DW, it still wouldn't make sense.
DW: Again, thanks for the comment.